Billy's Pool is a 1. 5-acre coarse fishing lake at BK Fisheries (Billy Knott Fisheries), set in 15 acres of Cornish countryside in the valley of St Erth, near Hayle. The lake ranges from 4 to 8 feet in depth and features an island.

It holds a large head of carp to 18lb, bream to 5lb, roach, rudd, orfe, and perch over 5lb. The fishery sits alongside the River Hayle and is accessible by road and rail from Hayle, St Ives, and Penzance, approximately 1. 5 miles from the A30.

Level paths, car parking close to the lake, and facilities for disabled anglers are provided on site. Weekly matches and leagues are held on the lake, which regularly produces match weights exceeding 100lb in summer.